<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>监听器语法</title>
</head>
<body>
    <script>
        var vm=new Vue({
            el:'#app',
            data:{
                val:"简单对象初始值",
                obj:{
                    name:"复杂对象name",
                    value:"复杂对象value",

                }
            },
            watch:{
                val:function(newVal,oidval){
                    console.log(newval,oldval);
                    console.log(this.val)
                },
                obj:{
                    deep:true,
                    handler:function(new_val,old_val){
                        console.log(new_val,old_val)
                    }
                }
            }
        })
    </script>
</body>
</html>